Illustration
Armandii Snowdrift Clematis
Clematis armandi 'Snowdrift'
Also called snowdrift evergreen clematis and snowdrift clematis
Armandii Snowdrift Clematis blooms from March through April.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Armandii Snowdrift Clematis
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 7–9. Expect it to reach about 21 ft tall and 12 ft wide at maturity, in roughly 3 years (a house reading).
What was checked
Mature height and spread, hardiness zones, sun, water, bloom months and color and the trait tags were checked against named botanical sources for this plant, with what the sources could not settle written down; years to mature size rests on a recorded house rule where no publisher states one, and is marked so; its common name and alternate names have not been checked yet. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Armandii Snowdrift Clematis
Plant Armandii Snowdrift Clematis in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 8, the middle of its hardy zones 7 to 9, spring means February to April and fall means September or October. Once settled, it blooms from March to April.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 8, the middle of this plant's hardy range, start with zone 8 in February. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Armandii Snowdrift Clematis get?
21 fttall5 ft 7 inan adult12 ftwideSee Armandii Snowdrift Clematis in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Armandii Snowdrift Clematis
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Give Armandii Snowdrift Clematis about 12 ft of clear ground in every direction, measured from its center. It is one plant with room around it, not a row, and a raised bed is too small for it.
Add Armandii Snowdrift Clematis to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Armandii Snowdrift Clematis' height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 8 published sources on September 26, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- RHSRoyal Horticultural Societyheight, spread, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity
- Plant Addictsheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and toxicity
- NC State ExtensionClematis armandi, species pagesun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity
- patuxentnursery.comPatuxent Nursery (Bowie, Maryland)height, spread, hardiness zones, sun, water, bloom months and color, trait tags and soil
- plants.rogersgardens.comRoger's Gardens (NetPS Plant Finder entry 10191)height, spread, hardiness zones, sun, water, bloom months and color, soil and diseases
- BBC Gardeners' WorldMagazineheight, spread, sun, water, bloom months and color and toxicity
- cornellfarms.comCornell Farm (Portland, Oregon)height, spread, hardiness zones, sun and bloom months and color
- greenleafnursery.comGreenleaf Nursery (wholesale grower)height, spread, hardiness zones and bloom months and color
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Armandii Snowdrift Clematis
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
In the buttercup family; the sap's protoanemonin irritates and can blister skin, and it sickens dogs, cats and horses. NC State rates its poison severity high. per NC State and ASPCA
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.